请大家讨论这一版的必要性,UP goooooooooooooooooooooooooon

[mythutest]

2004微软创新杯软件开发大赛 软件开发竞赛 (未解决问题)
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软件开发竞赛
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想bishi这一版的板猪都没的鄙视

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[windwound]

If three people are chosen at random then what is the probability that no two of them were born on the same date of the month of June?

203/225
201/225
115/450
None of these
Can't be determined

2Recall that P(S) denotes the "power set", or the set of all possible subsets, of S. If S = {1, 2, {1}}, which of the following statements is NOT true?

{2} ? P(S)
{1} ? S
{{1}} ì S
{{2}} ì P(S)
None of these (all of the above are true).

If a wall clock takes 5 seconds to strike 5 o'clock, then how long will the same clock take to strike 9 o'clock?

9 seconds
10 seconds
8 seconds
9.5 seconds
None of these




At Philip's Odd Farm, a duck and a half lays an egg and a half in a day and a half. How many eggs would seven ducks lay in a week and a half?

7
49
70
42
10

Question 16 - Discrete Math

What is the inverse of a if a group (Z, *) is defined as a*b = a + b + 1 " a, b ? Z ?

-2
0
-a - 2
a - 2
a + 2

Consider the lines 3x - 4y + 4 = 0 and 3x - 4y - 5 = 0 which are tangents to the same circle. What is the radius of the circle?

9/5
9/10
1/5
1/10
None of these

Question 22 - Combinatorics

What is the value of Snr=0 r/nCr if an = Snr=0 1/nCr ?


(n - 1) an
nan
1/2 nan
None of these
Can't be determined
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